Documentation: fix "gitlink::foobar[s]"

They should be spelled with a single colon.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-index-pack.txt

@@ -43,7 +43,7 @@ OPTIONS
 	a default name determined from the pack content.  If
 	<pack-file> is not specified consider using --keep to
 	prevent a race condition between this process and
-	gitlink::git-repack[1].
+	gitlink:git-repack[1].
 
 --fix-thin::
 	It is possible for gitlink:git-pack-objects[1] to build

Documentation/git-name-rev.txt

@@ -38,7 +38,7 @@ OPTIONS
 	Instead of printing both the SHA-1 and the name, print only
 	the name.  If given with --tags the usual tag prefix of
 	"tags/" is also omitted from the name, matching the output
-	of gitlink::git-describe[1] more closely.  This option
+	of gitlink:git-describe[1] more closely.  This option
 	cannot be combined with --stdin.
 
 EXAMPLE